Why do we care about knowing the friction between two materials?  Are there any applications for this? Physicists have careers discovering the coefficients of frictions between two surfaces.

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Friction is an incredibly important force in everyday life.  It is the resistance force to movement between the physical contact of two objects.  It allows us to plant our feet on the ground and walk forward and it allows us to grip items in our hands and pick things up.  But there are many more complex...

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